Mangas

あしたのきょうこさん -  あしたの今日子さん -  明日的今日子 -  Ashita no Kyoko-san -  Kyoko the Tomorrow
From MangaHelpers: The ruler of the demon world has come, with only his trusty assistant, to conquer the modern day human world! It's a little rough from the start, because most people just seem to think he's a cosplayer. Also, due to the worst recession the demon world has had in 500 years, though, he's a little underfunded. For his conquest, he's got to fight the Hero of the human world. She's Ichikawa Kyouko, a distractingly pretty, tough, modern-day girl who happened to pick up the giant sword that marks her as the chosen one. [tethysdust]
ケメコデラックス!, 鋼鐵新娘, 钢铁新娘, Kemeko DX, Kemeko DX!, The Unknown Girlfriend
10 years ago, high-school student Sanpeita dreamed he was engaged to a beautiful girl. One morning, an unknown homely girl suddenly pressed him for marriage. The homely girl was named Kemeko.In order to escape, Sanpeita left for school where Kemeko followed and showed up with an uproar. A larger disturbance was when Sanpeita was targeted by a rice cooker on the school's rooftop.As Sanpeita and his childhood friend Izumi were being attacked by the rice cooker, Kemeko saved them both. What is the girl's true shape!?
ケメコデラックス! -  鋼鐵新娘 -  KEMEKO DX -  Kemeko DX -  Kemeko DX! -  Kemeko Deluxe! -  The Unknown Girlfriend
From Dynasty Scans: 10 years ago, high-school student Sanpeita dreamed he was engaged to a beautiful girl. One morning, an unknown homely girl suddenly pressed him for marriage. The homely girl was named Kemeko. In order to escape, Sanpeita left for school where Kemeko followed and showed up with an uproar. A larger disturbance was when Sanpeita was targeted by a rice cooker on the school's rooftop. As Sanpeita and his childhood friend Izumi were being attacked by the rice cooker, Kemeko saved them both. What is the girl's true shape!?